Detachable and replaceable limit door for railway wagon

The invention discloses a detachable and replaceable limit door for a railway wagon, which comprises a bottom beam, a vertical beam, an upper limit plate, a supporting beam and a lower limit plate, wherein the vertical beam is vertically arranged on the bottom beam, one end of the vertical beam is detachably connected with the upper limit plate, the supporting beam is horizontally arranged on a base and is vertical to the base, the lower limit plate is detachably connected with the supporting beam, and one end of the lower limit plate is connected with the vertical beam. The upper limit plate and the lower limit plate in the limit door can be correspondingly replaced according to different limit measurement requirements, and the limit device is simple in structure, small in adjustment difficulty, capable of guaranteeing measurement accuracy through multiple adjustment, and high in adaptability to different track situations, so that the whole manufacturing cost is lower, the system is more suitable for being u